Here a commonly accepted fact about superconducting coaxial cables :
“𝐒𝐮𝐩𝐞𝐫𝐜𝐨𝐧𝐝𝐮𝐜𝐭𝐢𝐧𝐠 𝐍𝐢𝐨𝐛𝐢𝐮𝐦-𝐓𝐢𝐭𝐚𝐧𝐢𝐮𝐦 𝐜𝐚𝐛𝐥𝐞𝐬 𝐚𝐫𝐞 𝐨𝐟𝐭𝐞𝐧 𝐬𝐩𝐞𝐜𝐢𝐟𝐢𝐞𝐝 𝐢𝐧 𝐪𝐮𝐚𝐧𝐭𝐮𝐦 𝐚𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬, 𝐭𝐡𝐢𝐬 𝐦𝐚𝐭𝐞𝐫𝐢𝐚𝐥 𝐜𝐚𝐧 𝐛𝐞 𝐜𝐡𝐚𝐥𝐥𝐞𝐧𝐠𝐢𝐧𝐠, 𝐢𝐟 𝐧𝐨𝐭 𝐢𝐦𝐩𝐨𝐬𝐬𝐢𝐛𝐥𝐞 𝐭𝐨 𝐬𝐨𝐥𝐝𝐞𝐫. »
Take a look at the NbTi coax cables, from Quantum Coax.
Yes, they’ve developed a patented NbTi welding process on connectors, and it’s having a huge impact:
👉 𝐑𝐨𝐛𝐮𝐬𝐭𝐧𝐞𝐬𝐬: 95% of NbTi cables breaks are due to the connection between the NbTi and the crimp-style connectors.
Welding makes a connection that is robust enough for numerous thermal cycles.
👉 𝐒𝐢𝐠𝐧𝐚𝐥 𝐢𝐧𝐭𝐞𝐠𝐫𝐢𝐭𝐲: most signal losses (and therefore active heat load) comes from the quality of the connection between two different materials.
Soldered connections create the best electrical connection at the cable/connector interface.
𝐘𝐞𝐬, 𝐲𝐨𝐮 𝐬𝐚𝐰 𝐢𝐭 𝐫𝐢𝐠𝐡𝐭 𝐢𝐧 𝐭𝐡𝐞 𝐩𝐡𝐨𝐭𝐨, the outer conductor of the coax cable is made of braided NbTi fiber for ultimate easy handling.
This flexible MicroFlex cable makes the routing of coaxial cables at their final destination (such as a QPU) much easier than traditional semi-rigid coax cable.
All in all, that’s why Qnity feel very happy to have found Quantum coax😎.
